What was the most interesting question? How will you maintain a healthy lifestyle with the stress of a medical profession? I was asked this too
What was the most difficult question? None. Very conversationaly, really none of the questions were particularly interesting or difficult. I was asked this too
How did you prepare for the interview? Read this website, read up on healthcare issues and current events.
What impressed you positively? The Dean was very approachable and hung out with the interviewers during our breaks.
What impressed you negatively? My one-on-one interviewer was incredibly cocky and kept talking about himself.